QDockWidget {
    titlebar-close-icon: url(:/icons/close.svg);
    titlebar-normal-icon: url(:/icons/float.svg);
}
QDockWidget::title {
    background-color: #f5f5f5;
    border: 1px solid #cccccc;
    padding: 4px;
    text-align: left;
}
QDockWidget::close-button, QDockWidget::float-button {
    background: transparent;
    border: none;
    padding: 2px;
}
QDockWidget::close-button:hover, QDockWidget::float-button:hover {
    background-color: rgba(0, 0, 0, 0.1);
}